Pioneering documentary filmmakers David and Albert Maysles have a knack for capturing human behavior at its most revealing and disturbing.

Arguably their most disturbing work documented the crack conversations between two society dames. Released in 1975, “Grey Gardens” (7 p.m. Sunday, TCM) shocked and fascinated audiences with its intimate portrait of aging socialite Edith Bouvier Beale and her 50-something daughter, “Little” Edie. Shot at their decaying, vermin-infested East Hampton home, “Grey Gardens” seemed like a cruel collaboration between Tennessee Williams and Andy Warhol – “The Glass Menagerie” meets “Chelsea Girls” – an unflinching look at madness, claustrophobic family ties, decadence and isolation. The fact that the two women were cousins of Jackie Kennedy Onassis gave the film even more notoriety.

Over the decades, as tapes and DVDs became available, “Grey Gardens” became a cult classic. Some of Little Edie’s outfits have even inspired fashion designers. And now it has become the basis of a Broadway play, starring Christine Ebersole and Mary Louise Wilson, opening Nov. 2. TCM host Robert Osborne will interview Ebersole and Wilson before and after the film’s screening.

¢ Even the most illustrious families have skeletons in the closet. The History Channel repeats “Bloodlines: The Dracula Family Tree” (9 p.m. Sunday, History). The Florescus family has returned to Romania to uncover information about its famous ancestors, linked for centuries to the Dracula family, and united against the legendary figure Vlad the Impaler.

¢ “Inside Saddam’s Reign of Terror” (9 p.m. Sunday, National Geographic) recalls the systematic brutality of the deposed Iraqi dictator and presents video evidence used at his trial as well as testimony from victims.

Today’s highlights

¢ Spend 25 straight hours at 1313 Mockingbird Lane on the daylong marathon of “The Munsters” (5 a.m., TV Land). The extra hour compensates for the fact that we set our clocks back an hour, and 2 a.m. strikes twice.

¢ Daniel Radcliffe stars in the 2004 fantasy “Harry Potter and the Prisoner of Azkaban” (7 p.m., ABC).

¢ Hugh Laurie (“House”) is host of “Saturday Night Live” (10:30 p.m., NBC), featuring musical guest Beck.

Sunday’s highlights

¢ Scheduled on “60 Minutes” (6 p.m., CBS): the 2005 explosion in Texas City; Notre Dame football coach Charlie Weis; the U.S. Army’s remarkable battlefield Medivac units.